How do I get the object to the ground floor grid?
Sometimes it is difficult to locate the exact location of your object in the 3D editor.

You can directly set a number of properties for Meshes and other items in the Properties Panel.



The Properties Panel can be toggled with the 'n' key in any 3D view(and a number of other views).

To set the Location to 0 for X,Y,Z click and drag from the X input box to the Z so they are all highlighted. Then just type 0 to set them all to the same value.